According to law enforcement sources … the suspect entered LL’s Los Angeles area house around 2AM, but unfortunately for him the actor/rapper/badass was home.

We’re told LL heard some commotion downstairs, went to check it out … and found the intruder.

Sources say the intruder had tripped LL’s alarm system, but the “NCIS Los Angeles” star — who is a physical beast — decided to go hand-to-hand combat on the dude … and managed to detain him until LAPD arrived a few minutes later to make the arrest.

We’re told LL is okay, but the suspect — who will be booked for burglary — suffered a few bruises.

This makes me love this guy even more. God he’s sexy. I mean look at the header picture. Does he even look 44? That’s what I thought